Storage-battery electrode and process of making it.



1N0 IDrawing.

trode is as follows: An antimonial lead 15.

g is dipped in an aqueous solution of sulfuric To aZZ whom it may concern:

red-lead, wetted with an aqueous solution of chromium sulfate in five gallons. of dis water, whereupon it is ready for use.

6 T FFI E;

WILLIAM MORRISON, OF DES MOINES, IOWA.

S IGRAGE-BATTERY ELECTRODE AND rnoonss or MAKING IT.

Be it known that I, WILLIAM MORRISON, a citizen of the United States, residing at Des Moines, in the county of Polk and State of Iowa, have invented certain new and useful Improvements in Storage-Battery'Electrodes and Processes of Making Them, of which the following is a specification.

This invention especially relates to the production of negative-pole electrodes for storage or secondary batteries in which'the active material is finely-divided lead.

The preferred process of making the elecgrid or other suitable support and conduc' tor is pasted with a mixture of litharge and of sulfuric acid ancha small amount of by drogen peroxid, and allowed to thoroughly dry. The'amount of litharge in the mixture is preferably greater than that of the redlead. Thesurfaces of the active material are thenf serap-ed, as with a sharp-edged tool, to remove any glaze or skin and open the surficial pores. The electrode is then dipped in an: aqueous solution of glycerin and chromium sulfate, the preferred proportions being six pounds of glycerin anjdljone pound tilled water. The electrode is then dried and acid containing some hydrogen peroxid, and is again allowed to dry, causing the paste to fully swell and come in close contact with the grid; The pasted grid is formed by sub jecting it to cathodic reduction in an a'queous sulfuric acid solution, substantially eliminating the glycerin, andis washed in The process may be modified by causing the paste to swell by dipping it in the solution of sulfuric acid and hydrogen peroxid and drying it before, instead of after, it is dipped in the solution of glycerin and chromium sulfate.

-Such electrodes substantially maintain their initial charge-capacity for a long pee riod', and have a large capacity and great durability.

While the superior qualities of electrodes made by this process have been established 1 Specification of Letters Patent. Patented'NbV; 11911. Application filed September 29, 1911. Serial No. 651,963.'

red-lead gives porosity.

I claim:

1. A storage battery electrode, comprising a body of active material initially bonded by the solid reaction-products of lead oxid, a chromium salt and glycerin.

2. A storage battery electrode, comprising a body of active material bonded by the solid reaction-product of lead oxid anda chromium salt.

3. A storage battery electrode, comprising a body. of lead active material'initially bonded by lead-chromium and leadglycerin compounds.

4. A storage battery electrode, comprising a body of lead active material having intimately commingled therewith a lead chromium compound, constituting apermanent binder.

.5. Inthe manufacture of storage battery electrodes, the step which consists in initially bonding the active material with leadchromium and lead-glycerin compounds.

6. In the manufacture of storage battery electrodes, the step which consists in bonding the active material with a lead-chromium compound distributed throughout said active material.

7. In the manufacture of storage battery electrodes having lead active material, the

step which consists in impregnating the active' material with a solution of a chromium compound capable of reacting therewith to produce a binder.

8. The process of treating storage battery electrodes having lead active material, which comprises the step of submerging the electrode in a solution containing glycerin.

9. In the manufacutre of storage battery electrodes having lead active material, the step which consists in reacting on the active material with a chromium compound propoimd capable of roducing a binder, and

ducing a lead-chromium binder, and with glycerin. 10 glycerin. In testimony whereof I aflix my signature 10. The process; of making negative-pole in presence of two witnesses. 5 storage battery electrodes having pasted lead YVILLIAM MORRISOX. active material, which consists in both ex- Witnesses: r

panding the active material and impregnat- Crmms H. Form,

mg it with a solution of a chromium com- ROBERT I. HULsrzER'. 

